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Low-energy lattice excitations in the decagonal Al-Ni-Fe and icosahedral Al-Cu-Fe quasicrystals and the (Al,Si)-Cu-Fe cubic phase

Physics of the Solid State, ISSN: 1063-7834, Vol: 52, Issue: 4, Page: 771-775
2010
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The specific heat of decagonal AlNiFe and icosahedral AlCuFe quasicrystals and the AlSiCuFe cubic phase approximating the structure of the icosahedral alloy has been studied in the temperature range 4.2-40.0 K. All the three compounds exhibit low coefficients of the electronic heat capacity and pronounced deviations of the low-temperature lattice heat capacity from a cubic temperature law in the range 5-10 K. The results obtained by the thermodynamic method and inelastic neutron scattering have been compared and analyzed. It has been established that, at energies e{open} < 14 meV, the spectral density of thermal vibrations in the icosahedral quasicrystal is substantially higher than those in the cubic approximant and in decagonal quasicrystal. © Pleiades Publishing, Ltd., 2010.

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